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Elasticsearch: Add merge request title suggester

Arturo Herrero requested to merge 479051-add-mr-title-suggester into master

Description

This is the first merge request to support merge request search-as-you-type for GitLab Duo. Here, we create a new field for the suggester (title_suggester) with a recommended analyzer and tokenizer.

This adds the following mapping:

"title_suggester" : {
  "type" : "completion",
  "analyzer" : "title_suggester_analyzer",
  "preserve_separators" : true,
  "preserve_position_increments" : true,
  "max_input_length" : 50,
  "contexts" : [
    {
      "name" : "project_id",
      "type" : "CATEGORY"
    }
  ]
}

NOTE: We can only use one context because they work as an OR, see this comment for details.

Backfill migration runtime: !165177 (comment 2098341089).

Elasticsearch reference: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters.html

Related to #479051 (closed)

Edited by Arturo Herrero

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